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Rocksteady appears first, guarding a captive April while the player fights Bebop in the Sewers of level 1. He later appears, in a warehouse at the end of the level, as the player attempts to rescue April. He fights with a shoulder charge, and his machine gun. Notably, in some versions of the game, he is very easily defeated by crouching Donatello on top of the stake of crates at the edge, and repeatedly swinging his Bo downward.

Rocksteady serves as the first boss of the arcade game, coming out of a Mutant Module that has somehow breached April's apartment. He fights with his machine gun and shoulder charge, and will also kick away any Turtle that gets too close to him. In the arcade game, he later reappears in a dual-boss fight with Bebop. In most home versions, this fight is replaced with Baxter Stockman in his fly form.

Rocksteady's fight is very much like his previous incarnation, including being the first boss again, and having deflectable bullets. However, he had his machine gun again, and has a jump attack. A Foot Soldier also drops items from a window in an attempt to damage the player.

Rocksteady only appears in the Super NES version, dressed in pirate garb and wielding a fencing foil. Bebop accompanies him for a dual boss. The two are capable of getting their weapons stuck together, letting players hit them for free.

Rocksteady appears as the second boss, and this is the only time he appears in a game that Bebop does not also appear. He fights much like his Arcade Game version, only he is also capable of tossing grenades. An orange recolor version appears during The Gauntlet stage.